Nano tungsten oxide, which may be applied for preparing ceramic microsphere, is an excellent electrochromic material with good stability, mainly showing in the following two features:
1. It has better structural stability during color reversible change process, which requires electrochromic materials to be less prone to irreversible structural damage during ion insertion and extraction, thus showing good reversibility of redox and color change, and long cycle life.
2. With high chemical stability, good weather resistance and corrosion resistance, it can ensure the long-term normal operation of electrochromic devices.
The electrochromic device is generally divided into five lays. They are two transparent conductor layers (TC layers) and a counter electrode layer (CE layer), an ion conductor layer (IC layer), and an electrochromic layer (EC layer). And the features mentioned above is closely related to the properties of the EC layer material, which is one of the main factors that restrict the development of electrochromic materials.
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